For MgSiO the rarest component is (usually) Mg.
So, half the magnesium abundance is required as value.
The default value is 0.0.

real c_dust04:
The lower dust limit fraction
is specified with e.g.

real c_dust04 f=E15.8 b=4 n='Lower dust limit fraction' u=1
1.0E-10

It is used in the calculation of the settling velocity
where a division by the total density of monomers and dust is required.
To prevent this denominator to become zero a term
is added.
The default value is 0.0.

real c_dust05:
The minimum number of monomers during condensation
is specified with e.g.

For very small grains (just one or very few monomers) the condensation rates can
be very small in this dust model:
nucleation that would form already small clumps of monomers is not considered.
Therefore, to speed things up a minimum number of monomers can be given that is
considered for the condensation rate.
With 1.0 or smaller values the enhancement is switched off.
The default value is 0.0.

real c_dust06:
The sticking coefficient for the condensation rate
is specified with e.g.